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Finding the Fourth Proportional to 81,000, 111,768.12 and 45,187.20

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Solution

The fourth proportional to 81,000, 111,768.12 and 45,187.20 is: 62,351.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,000 : 111,768.12 = 45,187.20 : x
  2. Step 2: Convert to fraction form
    81,000/111,768.12 = 45,187.20/x
  3. Step 3: Cross multiply
    81,000x = 111,768.12 × 45,187.20
  4. Step 4: Simplify right side
    81,000x = 5,050,488,392.06
  5. Step 5: Solve for x
    x = 5,050,488,392.06/81,000
  6. Step 6: Final answer
    x = 62,351.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.